Desifer this for me..
Desifer this for me.. Truck in sig on a WOT run, supposed to be tuned for mods, getting a retune soon..
Short fuel trim both banks 0
LFT bank 1 +6
LFT bank 2 +5
LFT AVG 0
Computer AFR 12.1
Timing 29-32
Front o2's 930 and 940.....
Why is it running so rich>? need a new tune?
Short fuel trim both banks 0
LFT bank 1 +6
LFT bank 2 +5
LFT AVG 0
Computer AFR 12.1
Timing 29-32
Front o2's 930 and 940.....
Why is it running so rich>? need a new tune?
LTFT are not used at Wot, so that wont matter. Also, with our tune, The o2 voltage will still be changing at wot, so you need a wide band to show the actual air fuel ratio. It will be at 12.7. That 12.2 is what the computer happened to be commanding, That dont mean actual. the wot o2 voltage that you are seeing isnt accurate becase they are moving up and down very quickly to tune itself at wot on purpose. You cant accuratly guess the airfuel ratio with the o2 voltage on our tunes.
If the pcm is seeing an air leak from the headers would be the only reason why it is running rich with the tune. That is because it sees fresh air so it will be adding fuel for no reason to make up for a fake lean condition.
If the pcm is seeing an air leak from the headers would be the only reason why it is running rich with the tune. That is because it sees fresh air so it will be adding fuel for no reason to make up for a fake lean condition.
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Another thing is, Even if that was valid. the ltrim system is different values in every cell that the pcm is in. So that value could be at idle, which even on a non modified operating system would not effect a driving cell. 1-15.
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Originally Posted by wait4me
LTFT are not used at Wot, so that wont matter. Also, with our tune, The o2 voltage will still be changing at wot, so you need a wide band to show the actual air fuel ratio. It will be at 12.7. That 12.2 is what the computer happened to be commanding, That dont mean actual. the wot o2 voltage that you are seeing isnt accurate becase they are moving up and down very quickly to tune itself at wot on purpose. You cant accuratly guess the airfuel ratio with the o2 voltage on our tunes.
If the pcm is seeing an air leak from the headers would be the only reason why it is running rich with the tune. That is because it sees fresh air so it will be adding fuel for no reason to make up for a fake lean condition.
If the pcm is seeing an air leak from the headers would be the only reason why it is running rich with the tune. That is because it sees fresh air so it will be adding fuel for no reason to make up for a fake lean condition.
ok jesse i know you have tuned my pcm and im not ******* you, i know you can only get a mail order tune so accurate.
I have no headers leak. Installed them myself with copper gaskets i torqued the bolts down once and once again and ever since that they have never moved. no other leaks any where else also everything is sealed well from the headers to the ypipe to the cutout. no noise besides the regular noises you get from long tubes.
Its going on a wideband dyno for some numbers this weekend so ill see what it puts down and what the AFR is..
I have no headers leak. Installed them myself with copper gaskets i torqued the bolts down once and once again and ever since that they have never moved. no other leaks any where else also everything is sealed well from the headers to the ypipe to the cutout. no noise besides the regular noises you get from long tubes.
Its going on a wideband dyno for some numbers this weekend so ill see what it puts down and what the AFR is..
uhh the running rich issue,
for most the reason i dont think its a mech. running issue i just think maybe a tigher tune on the VE tables.
I had it live data logged and ran rich all across the table if i remember right.
for most the reason i dont think its a mech. running issue i just think maybe a tigher tune on the VE tables.
I had it live data logged and ran rich all across the table if i remember right.
Positive trims means the vehicle thinks it is running lean. so it added to bring it back to a 14.7 air fuel ratio. The Vehicle will be staying at a 14.7 any time it is in closed loop. That trim number just means that it had to add 5% of fuel to make it a 14.7 at that point.
Yes i understand all that, i edited my post above. When a car/truck sees it running lean it will try and compensate for the issue by adding fuel on the trim, completly understood. My question is mine doing that.
It just means that your computer is doing its job and adjusting itself.
After your dyno and you get me a wot fuel ratio chart, I can force it to be exactly perfect to what ever you request.
After your dyno and you get me a wot fuel ratio chart, I can force it to be exactly perfect to what ever you request.
Another thing to remember is, The Ve table does effect fuel, but it might not be the reason why a ltrim would be showing higher. MASS Air sensors, and o2 sensors also effect the ltrim number. So if the MOTORS VE has not been changed via camshaft or something that changes it ability to flow more air per rotation, then the Ve table should remain untouched. Anything within 5 % is fine. Normal things effect that number. Temperature, Even the octain/type of gas you use. That is why the system is there in place...
Well everything is in good running order. o2's are both switching fine, mass have ben recently cleaned with CRC MAF cleaner. The only mods i have added since you last retuned it since the headers a new CAI and P&P TB and ive been having this issue before that. also it always rich like this.
Well if i decided to send this in after the dyno with the sheet i know another issue is off the line timing is still kinda low, could use a little more.
Well if i decided to send this in after the dyno with the sheet i know another issue is off the line timing is still kinda low, could use a little more.
Originally Posted by 04BlackGmc
Well everything is in good running order. o2's are both switching fine, mass have ben recently cleaned with CRC MAF cleaner. The only mods i have added since you last retuned it since the headers a new CAI and P&P TB and ive been having this issue before that. also it always rich like this.
Well if i decided to send this in after the dyno with the sheet i know another issue is off the line timing is still kinda low, could use a little more.
Well if i decided to send this in after the dyno with the sheet i know another issue is off the line timing is still kinda low, could use a little more.